Author Topic: A shunt for real currents  (Read 4857 times)

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Offline Henrik_V

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A shunt for real currents
« on: March 03, 2017, 02:20:30 pm »
Two pictures of a retirered 10µOhm shunt , 23kA  0.03%   



to big for my collection  :'(

The small motor stirrs the coolant
« Last Edit: March 03, 2017, 02:55:33 pm by Henrik_V »
Greetings from Germany
Henrik

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Offline poorchava

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Re: A shunt for real currents
« Reply #1 on: March 03, 2017, 02:22:55 pm »
Pictures don't show, at least for me.
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Offline Henrik_V

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Re: A shunt for real currents
« Reply #2 on: March 03, 2017, 02:53:15 pm »

different source..
« Last Edit: March 03, 2017, 02:55:59 pm by Henrik_V »
Greetings from Germany
Henrik

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Offline T3sl4co1l

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Re: A shunt for real currents
« Reply #3 on: March 03, 2017, 03:05:20 pm »
Dang, and I just installed a meter on my aluminum smelting pot line!

Tim
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Offline Tom45

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Re: A shunt for real currents
« Reply #4 on: March 03, 2017, 03:09:43 pm »
Quote
Two pictures of a retired 10µOhm shunt , 23kA  0.03% 

Why was it retired? What did they replace it with?
 

Offline manganin

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Re: A shunt for real currents
« Reply #5 on: March 03, 2017, 08:07:59 pm »
Two pictures of a retirered 10µOhm shunt , 23kA  0.03%

Otto Wolff
 

Offline babysitter

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Re: A shunt for real currents
« Reply #6 on: March 03, 2017, 09:25:42 pm »
The small motor stirrs the coolant

... which is possibly some polychlorinated biphenyl

Great device, I would take it but only if its certified empty and cleaned. :)

What do you know about its history? Where was it, what kind of company, useage?
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Offline e61_phil

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Re: A shunt for real currents
« Reply #7 on: March 03, 2017, 09:28:48 pm »
Where was it, what kind of company, useage?

I would think it is from the PTB :)
 

Offline Jeroen3

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Re: A shunt for real currents
« Reply #8 on: March 03, 2017, 09:31:44 pm »
Probably a shunt for railway since it says "gleichstrom" (DC).
 

Offline Vgkid

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Re: A shunt for real currents
« Reply #9 on: March 03, 2017, 10:24:17 pm »
Wow, that is definitely a huge shunt.
Otto Wolff
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It is amazing what they were able to make back then, and how stable some of those standards are.
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Offline Henrik_V

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Re: A shunt for real currents
« Reply #10 on: March 03, 2017, 11:10:54 pm »
Where was it, what kind of company, useage?

I would think it is from the PTB :)

Where: PTB is rigth :)
But sorry, no idea about the history ... I'm in the acceleration dep.  ...


Otto Wolff
With your nick? :)   Probably yes, I check it next friday :D

The small motor stirrs the coolant

... which is possibly some polychlorinated biphenyl


It's marked to use native naphtha and water

Why was it retired? What did they replace it with?
No idea :) Maybe they changed the connector system ?   :D

Just a nice big stone of old metrology,  I don't know about the internal contstruction, but if it can take the dI/dt , you can measure the current of a thunderbold  8) ;D ;D
Well, (23kA)² x 10µ\$\Omega\$ = 5.29kW ...
« Last Edit: March 03, 2017, 11:18:58 pm by Henrik_V »
Greetings from Germany
Henrik

The number you have dialed is imaginary, please turn your phone 90° and dial again!
 

Offline HighVoltage

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Re: A shunt for real currents
« Reply #11 on: March 05, 2017, 11:45:38 am »
Definitely big.

I have seen one of these in the Aluminum factory in Hamburg / Germany in the mid 1980s
This plant hat the largest power consumption in Hamburg.
And they got the power for (almost) free.

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Offline Assafl

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Re: A shunt for real currents
« Reply #12 on: March 05, 2017, 12:22:15 pm »
The shunt that shan't be used - no more. The shunt forever to be shunned - doomed by its own bigly-ness.

I guess those two thumbscrews are where you'd connect your Voltcraft DMM?
« Last Edit: March 05, 2017, 12:25:21 pm by Assafl »
 

Offline lowimpedance

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Re: A shunt for real currents
« Reply #13 on: March 06, 2017, 12:25:38 am »
I guess those two thumbscrews are where you'd connect your Voltcraft DMM?
.......LOL............

Quite a few un loved ones stuck under benches around work here too!. Excellent door stops for very big doors  :D.
The odd multimeter or 2 or 3 or 4...or........can't remember !.
 

Offline Vgkid

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Re: A shunt for real currents
« Reply #14 on: March 06, 2017, 03:28:45 am »
Quite a few un loved ones stuck under benches around work here too!. Excellent door stops for very big doors  :D.
:(
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Offline Henrik_V

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Re: A shunt for real currents
« Reply #15 on: March 06, 2017, 08:08:04 am »
I guess those two thumbscrews are where you'd connect your Voltcraft DMM?

DMM?
No, regarding the history a Weston-Element, a compensator and a lightbeam mirror galvanometer  ;D
or to cite Wildar:
Greetings from Germany
Henrik

The number you have dialed is imaginary, please turn your phone 90° and dial again!
 

Offline Assafl

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Re: A shunt for real currents
« Reply #16 on: March 06, 2017, 11:07:58 am »
I guess those two thumbscrews are where you'd connect your Voltcraft DMM?

DMM?
No, regarding the history a Weston-Element, a compensator and a lightbeam mirror galvanometer  ;D

Ah yes - a Weston cell, a potentiometer and a null galvanometer (someone is selling a Guildline lightbeam galvanometer on eBay). I will be candid that until I started reading the metrology forum I never understood why a potentio-meter had "meter" as part of the word. Why not potentiovary or potentiotrol or something like that.

Is there a better way than a shunt to measure 23,000 Amps? How do they measure current at power stations? (I am just reading about Fiber Optic Current Sensors for measuring insane levels of DC current - really cool)
 

Offline Codebird

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Re: A shunt for real currents
« Reply #17 on: March 06, 2017, 11:32:07 am »
Quote
Is there a better way than a shunt to measure 23,000 Amps?

These days, hall effect sensor. Those weren't around back in the Shunt Age, so you got monstrosities like that instead.
 

Offline Jeroen3

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Re: A shunt for real currents
« Reply #18 on: March 06, 2017, 06:58:29 pm »
Nothing beats the bandwidth of a shunt.
https://www.utwente.nl/en/news/!/2017/3/313543/electronic-energy-meters-false-readings-almost-six-times-higher-than-actual-energy-consumption

Quote
Is there a better way than a shunt to measure 23,000 Amps?

These days, hall effect sensor. Those weren't around back in the Shunt Age, so you got monstrosities like that instead.
For DC I still think shunts are used more. Hall effect sensors are easily offset by magnatic fields. This is why you should avoid LEM sensors at all cost.
« Last Edit: March 06, 2017, 07:00:40 pm by Jeroen3 »
 

Offline bji900

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Re: A shunt for real currents
« Reply #19 on: March 06, 2017, 07:11:17 pm »
I would love to see the buss bars that connected this to the system and for that matter the system that it ran!
 

Offline Assafl

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Re: A shunt for real currents
« Reply #20 on: March 06, 2017, 09:22:44 pm »
I read that Fibre Optic Fiber Sensors are replacing the big Hall Effect sensors. ABB talk about replacing Hall Effect sensors weighing 2 tons.

https://library.e.abb.com/public/74d5555d2a9c2998c12579a00038ff0a/FOCS_brochure_3BHS362996_E01.pdf

The Hall effect senor I got from Aliexpress weight a few grams. 
 

Offline cncjerry

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Re: A shunt for real currents
« Reply #21 on: March 19, 2017, 07:20:52 pm »
Where can I pick one of these up? It will go nicely with my other boat anchors.
 


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